Burglary-protection means



May s, 1925. 1,536,804

F. C. AMASON BURGLARY PROTEGTI-ON MEANS Filedfieb 9, 1920 `rPatented May 5, 1925,.

. unirse STATES 'raars C, Mason. or Los ANGELES.. @mamma BUBGLARYPBOTECTWN MEANS,-

Applicaton -led February 9,A 1920. Serial No. 357,124.

To @ZZ 107mm it may concern;

Be it known that I, FRANK C. MAsoN, a citizeny of the United States, residing at Los Angeles, in the 'coun-ty of Los Angeles I and State .of California, have invented'a new and useful Burglary-Protection Means,

of which the follou'ii-ng is a specification.

This invention relates to means forsafeguarding vaults or other enclosures from ingress by b urglai's, va-ndV the main object oft' the invention yis to provide simple, cheap and cllective means for applying electrical pro-- tective conductors to the wall of such an ,enclosure for connection with va burglary alarm circuit.

A further object of the invention is toV provide a sectional or unit construction com thereto V iin-proved protective means adapted tor use ivi-th a closed electric circuit; *Y y Fig. 2 is a detail section vof a joint .for the `protective means f 3 is a similar'view ot a form vof the invention adapted for both open and .closed velectric circuit protection.

Referring to Fig'. v1, a portion of the avail ofv the enclosure to :be protected is indicated at 1. On either side of said wall, :for .example, on the inner side, 'are arranged a plurality of protective plates or sheets 2 consisting, for example, vof 4Wall-board,V or similar insulating material', saidplates or sheets Ebeing secured to one another, and, 'it

desired, to the YWall 1 by .suitable means,

for example, by bolts Vor Yflag screws 8 .extending between the successive plates 2 (and,

afl'ord the requisite protection and with hor-`V izontal grooves 8 extendingA parallel and adjacent to ,the upper and loyver edges-oft the lplate 2 and an electric circuit Wire or conductor 9 is placed in these grooves, so

Fig. 1 isa perspective view of a portionl of a Wal-l -of an enclosure provided with .my

if desired, into connection lw-ithfthe Wall 1) ,L

as toV extend `alternately up and down' in successive vertical .grooves 7 crossing over between the successive grooves 1' alternately in the top and bottomgrooves S, so as to torni a .series oft" loops `extending over the area .of the plate and to give a zigzag or itortuous arrangement of tlie Wire, serving to form an effective electrical protection.

yAtterthe Wire is laid in the grooves in this manner. strips 10 of paper .or other suitable material are applied and are laid over the grooves and secured to the plate 2 by pasting, ceinenting, or otherwise, to l'retain `the wire in place, the .construction being such that the protective xviring'is contained .or

embedded-within and supported by the'in sulating plate. lhile the plates are as suined tobe .of insulating material, it is desirable that .the Wire 9 should be insulated wire to avoid'any leakage. yOnly two sections Yof the plates 2 are .show-n in Fig. 1 but it will be understood that any desired number ot plates maybe used, for example, so `as to cover or line Lthe entire Wall .of the enclo-` Ysure to be protected. "These plates or sections ycan .be manufactured as Separate auiits and assembled in place yon the job ,with ininimum of labor and -expense, and when so assembled, .the Wires 9 of successive, sections .may be connected together, as shown in Fig. 2, the Wires being brought through the.

holes 12 in .the respective plates, kspliced andV soldered together, as indicated at 15` so as to permanently `electrically connect the Lprotective `Wires ,of adjacentr sections, suitable insulating shoes :M beingprovided to lcoverthe joints.

ln applying my invention in connection with a closedk circuit system the circuit arrangement inay be as' shown diagrammatically in Fig. 1, and the respective :units of.

they `Wire 9 tor the structure being con` nected "to Wires 15 and 16 .of an ,electric Vvcircuit including a vbattery or .source `of cui'- above described, vthe galvanometer 4or elecl troinagnetic controlling device 19 is nor-r inally energized by the vbattery 17 so as to hold the galvanometer needle out of contact with both ot' the contacts 2S and 2S on opposite sides thereof, said galvanometer needle being provided with the usual means, not shown, tor moving it into connection with one of the contacts 28 on de-energiZa-- tion ot the device 19. It, therefore, an interruption of the circuit occurs, for example, by rupture of any part of the wire 9 in any one of the sections 2, the galvanometer 19 being cle-energized the galvanometer needle will make connection with contact 28 closing the relay circuit 23 and operating the alarm or signal. H, on the other hand, au attempt is made to tamper with the circuit by inserting a connection to shortcircuit the protective wires the resultant change in resistance otl the protective circuit will cause the needle of the galvanometer to make connection with one or the other ot' the contacts 2S or 2S and operate the alarm circuit.

Il desired, the protective sections 2 may be provided with metallic armor formed as linings or sheaths, as shown at 30 in Fig. 3,

said sheaths consisting ot sheet iron 0r other sheet niet-al, secured to the sections 2 by nietallic rivets 31, or otherwise, the metallic sheathing ot the several sections or units being connected together b y suitable means, such as indicated at 32. lVith this construction the system is adapted for use on both closed and open circuits, as indicated diagrammatically in Fig. 3, wherein the connections to the closed circ-uit wire 9 are as above described, and in addition connection 33 is provided it'rom the relay wire 21 to the metallic sheathing atoresaid, and the protective circuit wire 15 is connected by wire 3-1 to the circuit wire 21, so that if an attempted intrusion through the protective wall by a inetallic instrument a connection is made between wire 9 and the metallic sheathing 30 the relay 2?) will be operated by current passing from the battery through relay 23, wires 2l. and sheathing 9 and wires '9, 15, 3i and 21 back to battery 22, so as to cause operation ot the alarm circuit.

lt will be understood that the plates 2 may be placed either vertically or horizontally, and that. the scorings or grooves therein may extend in any desired directions.

The plates 2, when assembled as above described, form a selt1 supporting structure and the entire enclosure may be formed ot such plates assembled in such manner as to constitute the top, bottom and side walls olf such enclosure and secured together in any suitable manner. The armored or metal sheathed plates, such as shown in Fig. 3, are especiallyv adapted 'for such use.

ln applying the invention to the armored construction such as shown in Fig. 3, one ot the battens overlapping the joint between the successive plates may be made of metal so as to electrically connect the armor of successive plates, a portion oi such a batten being shown at 32 in Fig, 3. 1t will be understood that with the construction shown in Fig. 3 in which the armor or metal sheathing on opposite sides of each plate is connected by metallic rivets 31, the entire armor system will be in electrical connection constitutinq one side ot the open circuit; the other side being constituted by the interior wire 9.

lhat I claim is:

1. ln an electrical protective system a wall consisting of a series ot' similar sections, each section comprising an insulating' plate providedwith a protective conductor contained therein, and each section having a metallic sheathing secured to and extending over a tace thereof, means t'or rigidly securing said sections together and supporting the same to form a wall structure, means for connecting said protective conductors ot' Vsuccessive sections in series relation, means for electrically connecting the metallic sheathing of the several sections and electrical alarm circuit means having closed circuit connections including said protective conductor and open circuit connections including said protective conductor on one side ot the circuit and said metallic sheathing on the other side of the circuit.

ln an electrical protective system, a wall consisting` ot a series of similar sections, each section comprising an insulating plate provided with a protective conductor contained therein, metallic sheathing secured to opposite sides of each plate, said protective conductor being insulated by the material otl said plate from the metallic sheathing on one side ot the plate, means for insulating said protective conductor from said sheathing on the other side ot said plat-e, means electrically connecting the metallic sheathing on the opposite sides o'teach plate, means rigidly securing said sections together and supporting the same to form a wall structure, mea-ns electrically connecting' said protective conductors ot successive plates in series relation, means electrically connecting the metallic sheathing of adjacent sections, and electrical alarm circuit means comprising closed circuit connections including'said protective conductors, and open circuit connections connected at one side to said protective conductors and at the other side to said metallic sheathing.

In an electrical protective system, a wall element comprising an insulating plate having parallel grooves extending in one tace thereof and provided with grooves extending transversely to the aforesaid grooves and a protective conductor extending back and forth within said parallel and transverse grooves so as to be embedded in said plate and extend over the same, strips of thin flexible insulating material extending over thc grooves and secured to the plate, a metallic sheathing extendingy over said plate and over said strips'offlexloley insulating material and secured to the plate andV a closed electric alarm circuit including said protective conductor and an, open electric alarm circuitconnected at one side to said( 

